textproduct: Quad Cities

KEY MESSAGES

- High pressure will settle in today and bring a period of quiet and dry weather through Monday.

- Another active weather pattern will set up in the middle of the upcoming work week, bringing the potential for rounds of showers and storms. Heavy rainfall may accompany these storms.

- Temperatures will remain near to slightly above seasonal norms through the next week.

SHORT TERM /THROUGH MONDAY NIGHT/

Issued at 200 PM CDT Sun Sep 27 2026

Spotty light rain across the far western and southwest counties will continue to decrease in coverage through this afternoon as forcing aloft wanes. High pressure will gradually build southward into the Upper Mississippi Valley and Great Lakes regions into Monday. For tonight, expect lows in the 50s across eastern Iowa and northwest Illinois with some patchy fog possible. Then for Monday, a very nice early fall day is expected with highs in the low to mid 70s, light winds, and continued dry conditions!

LONG TERM /TUESDAY THROUGH SUNDAY/

Issued at 200 PM CDT Sun Sep 27 2026

The persistent trof over the eastern CONUS will start to break down through the first half of the work week, with the ridge that has been locked in place overhead finally starting to track easterly. As this shifts east, upper level flow becomes southwesterly as a trof digs into the southwestern CONUS. This long fetch of southwesterly flow will have a connection to the Eastern Pacific, where we have tropical systems in place. This pattern will help guide these systems northeast into the central CONUS, serving as a moisture conveyor into the region. Not only will this help supply moisture to the region, but llvl southerly/southwesterly flow will usher Gulf moisture in as well. Thus, an anomalously moist airmass will be in place through mid week, with PWATS between 1.50-2.00" moving in.

The wave over the Rockies will also guide bouts of energy into the Upper Mississippi River Valley, with a baroclinic zone setting up nearby and serving as a focal point for precipitation chances. Thus, with plenty of moisture and forcing moving into the area, precipitation chances will be on the rise again. The first round of showers and storms may work into parts of the area as early as Tuesday night, with persistent PoPs remaining through Wednesday and Thursday. There remains much uncertainty with the individual storm tracks and timing though, with the location of the baroclinic zone also uncertain. Thus, will largely message that we will see chances for showers/storms through at least the middle of next week, with the potential for heavy rainfall as well. As such, the WPC has highlighted our area in a Day 4 Slight Risk, level 2 of 4, for Excessive Rainfall and localized Flash Flooding. Stay tuned on upcoming forecasts for updates on timing and potential amounts as confidence increases. Late week and into the weekend, guidance favors a continuation of the active weather, with PoPs persisting.

AVIATION /00Z TAFS THROUGH 00Z MONDAY/

Issued at 609 PM CDT Sun Sep 27 2026

High pressure sits across Wisconsin early this evening with light winds at eastern Iowa TAF sites. Expecting mid level clouds to slowly decrease through 15 UTC Monday as a weakening storm systems drifts southward with only high clouds remaining across the area. There is a possibilty of MVFR ceilings and visibilities to develop at KDBQ and KCID after 8 UTC tonight with lower confidence in MVFR ceilings. Winds will turn to the southeast after after 18 UTC Monday with speeds around 5 knots.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...None. MO...None.